function generatePagination(total, pageSize, pageIndex) {

    /* 创建style标签并设置style样式 */
    let style = document.createElement('style');
    style.innerHTML = "#pagination{width:100%;margin-top:30px;position:fixed;left:0;display:flex;padding-left:0;}#pageTips{position:fixed;right:10px;font-size:15px;}ul li{list-style:none;display:inline-block;user-select:none;}.list-items{width:36px;height:36px;line-height:36px;text-align:center;background-color:#fff;color:#000;cursor:pointer;transition:all .3s;border:1px solid #dedede;border-radius:5px;}.list-items:hover{background-color:#e9ecef;border-color:#dee2e6;}.active,.active:hover{color:#fff;background-color:#C8261C;border-color:#C8261C;}"
    document.getElementsByTagName('head').item(0).appendChild(style);

    /*  
     需要一个<ul id="pagination"></ul>标签
     total; // 总数据的数量
     pageSize; // 一页显示数量
     pageIndex; // 当前页 
    */
    let totalPage = Math.ceil(total / pageSize);  // 总页数
    function initPagination() {
        let pagination = document.querySelector('#pagination');
        let pageHtml;  // 按钮内容
        let prevButton = `<li class='list-items' id='btnPrev'>&laquo;</li>` // 向左
        let nextButton = `<li class='list-items' id='btnNext'>&raquo;</li>`// 向右
        let firstPage = `<li class='list-items' pagenumber=1>1</li>`// 第一页
        let lastPage = `<li class='list-items' pagenumber=${totalPage}>${totalPage}</li>` // 最后一页
        let leftOmitPage = `<li class='list-items' id='btnGoLeft'>...</li>` // 省略号
        let rightOmitPage = `<li class='list-items' id='btnGoRight'>...</li>` // 省略号
        let pageTips = `<div style='line-height:38px' id='pageTips'>${pageIndex} - ${totalPage} of ${total} items</div > `;
        pageHtml = prevButton; // 添加向左的按钮

        /* 生成页数 */
        if (totalPage <= 10) {  // 总页数小于等于10页全部显示
            for (let i = 1; i <= totalPage; i++) {
                pageHtml += `<li class='list-items' pagenumber=${i}>${i}</li>`;
            }
        } else if (pageIndex <= 8) { //总页数大于10且当前页远离总页数
            for (let i = 1; i <= 9; i++) {
                pageHtml += `<li class='list-items' pagenumber=${i}>${i}</li>`;
            }
            pageHtml += rightOmitPage;
            pageHtml += lastPage;
        } else if (pageIndex > totalPage - 7) { //总页数大于10且当前页接近总页数
            pageHtml += firstPage;
            pageHtml += leftOmitPage;
            for (let i = totalPage - 8; i <= totalPage; i++) {
                pageHtml += `<li class='list-items' pagenumber=${i}>${i}</li>`;
            }
        } else { //除开上面两个情况 当前页在中间
            pageHtml += firstPage;
            pageHtml += leftOmitPage;
            for (let i = pageIndex - 3; i <= pageIndex + 3; i++) {
                pageHtml += `<li class='list-items' pagenumber=${i}>${i}</li>`;
            }
            pageHtml += rightOmitPage;
            pageHtml += lastPage;
        }
        pageHtml += nextButton; // 添加向右的按钮
        pageHtml += pageTips;
        pagination.innerHTML = pageHtml;
        document.querySelector("li[pagenumber='" + pageIndex + "']").classList.add('active');

        let pagenumberBtns = document.querySelectorAll("li[pagenumber]"); // 获取所有的页码按钮

        /* 点击页码按钮进行翻页 */
        pagenumberBtns.forEach(function (elements) {
            elements.onclick = function () {
                pageIndex = Number(this.innerHTML); // 当前页
                document.querySelector("li[pagenumber='" + pageIndex + "']").classList.add('active');
                pageHtml.innerHTML = '';
                initPagination();
            }
        })

        /* 向左翻页 */
        document.getElementById('btnPrev').addEventListener("click", function () {
            if (pageIndex > 1) {
                pageIndex--;
                pageHtml.innerHTML = '';
                initPagination();
            }
        })

        /* 向右翻页 */
        document.getElementById('btnNext').addEventListener("click", function () {
            if (pageIndex < totalPage) {
                pageIndex++;
                pageHtml.innerHTML = '';
                initPagination();
            }
        })

        /* 向左快速翻页 */
        let btnGoLeft = document.getElementById('btnGoLeft');
        if (btnGoLeft) {
            btnGoLeft.addEventListener('mouseenter', function () {
                this.innerHTML = '&lt;'
            })
            btnGoLeft.addEventListener('mouseleave', function () {
                this.innerHTML = '...'
            })
            btnGoLeft.addEventListener("click", function () {
                if (pageIndex > 10) {
                    pageIndex -= 10;
                    pageHtml.innerHTML = '';
                    initPagination();
                }
            })
        }

        /* 向右快速翻页 */
        let btnGoRight = document.getElementById('btnGoRight')
        if (btnGoRight) {
            btnGoRight.addEventListener('mouseenter', function () {
                this.innerHTML = '&gt;'
            })
            btnGoRight.addEventListener('mouseleave', function () {
                this.innerHTML = '...'
            })
            btnGoRight.addEventListener("click", function () {
                if (pageIndex < totalPage - 10) {
                    pageIndex += 10;
                    pageHtml.innerHTML = '';
                    initPagination();
                }
            })
        }
    }
    initPagination();
}


